[GitHub] [cordova-ios] idoodler commented on issue #417: Keyboard Dismissal Leaves Viewport Shifted in iOS 12 / XCode 10

[GitBox <gi...@apache.org>]

idoodler commented on issue #417: Keyboard Dismissal Leaves Viewport Shifted in iOS 12 / XCode 10
URL: https://github.com/apache/cordova-ios/issues/417#issuecomment-477533972
 
 
   > Hi all, i am facing that issue run on IOS 12 that was built with Xcode 10 (if you build with XCode 9, the issue don't appear). IOS 12 will automatic change content offset of WKScrollview in WKWebview fit with height of keyboard in case keyboardWillShow, but it didn't revert it in case keyboardWillHide. That is my solution to fixed it, hope it help for you.
   > 
   > ```
   > /**
   >  * observer notification when keyboard will hide
   >  */
   > [[NSNotificationCenter defaultCenter] addObserver:self
   >                                                  selector:@selector(keyboardWillHide)
   >                                                      name:UIKeyboardWillHideNotification
   >                                                    object:nil];
   > 
   > /////////////--------------------------//////////////
   > /*
   >  *Description: this method was trigger by selector keyboarwillhide from notification
   >  */
   > -(void)keyboardWillHide
   > {
   >     if (@available(iOS 12.0, *)) {
   >         WKWebView *webview = (WKWebView*)self.webView;
   >          for(UIView* v in webview.subviews){
   >               if([v isKindOfClass:NSClassFromString(@"WKScrollView")]){
   >                       UIScrollView *scrollView = (UIScrollView*)v;
   >                       [scrollView setContentOffset:CGPointMake(0, 0)];
   >               }
   >           }
   >      }
   > }
   > ```
   
   Here is the Swift implementation for anyone wo needs it.
   
   `
   /**
    * observer notification when keyboard will hide
    */
   NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide), name:UIResponder.keyboardWillHideNotification, object: nil)
   
   /*
    *Description: this method was trigger by selector keyboarwillhide from notification
    */
   @objc func keyboardWillHide() {
           if #available(iOS 12, *) {
               webView.subviews.forEach { (subview) in
                   if let scrollView = subview as? UIScrollView {
                       scrollView.setContentOffset(CGPoint(x: 0, y: 0), animated: true)
                   }
               }
           }
       }
   `

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